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arXiv · 2010.00093

Phase-modulated cavity magnon polaritons as a precise magnetic field probe

Nicolò Crescini·Giovanni Carugno·Giuseppe Ruoso
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Abstract

We describe and operate a novel spin-magnetometer based on the phase modulation of cavity magnon polaritons. In this scheme a rf magnetic field is detected through the sidebands it induces on a pump, and the experimental configuration allows for a negligible pump noise and a high frequency readout. The demonstrator setup, based on a copper cavity coupled to an yttrium iron garnet sphere hybrid system, reached a sensitivity of $2.0\,\mathrm{pT/\sqrt{Hz}}$, evading the pump noise and matching the theoretical previsions. An optimized setup can attain a rf magnetic field sensitivity of about $8\,\mathrm{fT/\sqrt{Hz}}$ at room temperature. An orders of magnitude improvement is expected at lower temperatures, making this instrument one of the few magnetometers accessing the sub-fT limit. Due to its natural applications, miniaturization and multiplexing are eventually discussed.

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Nicolò Crescini, Giovanni Carugno, Giuseppe Ruoso. 2020-09-30. Phase-modulated cavity magnon polaritons as a precise magnetic field probe. https://doi.org/10.1103/physrevapplied.16.034036

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